Geogrids are used in the embankment of expressway to solve the construction problem of special soil in a certain extent for it can improve the indexes of soil

e.g. c and ?. Based on creep experiments for geogrids

it is shown that the bigger intensity geogrids have smaller strain under the same load action; and load and temperature have remarkable impact on the rheology of geogrids. Finite element method is effective to study the effect of geogrids on reinforcing soil; and the advantages and disadvantages of multifarious schemes can be compared conveniently. FEM(PLAXIS) is used to simulate the settlements under several different working states. The results indicate that the geogrids to control horizontal displacements is better than to control vertical displacement. The field load tests show that geogrids can boost bearing capacity of the road embankment severalfold

improve stress condition of soil

reduce differential settlements and total settlements effectively. Geogrids are good for reinforcing the road embankment observably and will be used in the practical engineering widely.